duane wrote: >Right now, I have a single /var/foo implemented as an >LVM vol using reiserfs. It turns out - I allocated too >much space to it. >I now need a /var/bar. >I'd like to re-allocate or shrink /var/foo by say 20G, >and give it to /var/bar. >The "How To" do this two step process is not very >clear in the docs. For reiserfs the (safe = unmounted logical volume) steps are: 1) umount the logical volume that contains the reiserfs to shrink. 2) Shrink the reiserfs by a specific amount using resize_reiserfs. 3) Reduce the logical volume containing the reiserfs using lvreduce by exactly the same amount as in step 2 above. 4) mount the just shrunk/reduced reiserfs/logical volume. It may help to relate the mount point /var/foo to the actual LVM lv device for example, /dev/vg/foo. The four steps above would become: # umount /var/foo # resize_reiserfs -s -20G /dev/vg/foo # lvreduce --size -20G /dev/vg/foo # mount -t reiserfs /dev/vg/foo /var/foo >I'm quite able to shrink and expand /var/foo - at >will. My confusion is - now that I have shrunk it - >reallocate the space I just got back? The following command will report the size of the logical volume: # lvdisplay /dev/vg/foo The reported size after the shrink/reduce should 20GB less than before. To use the freed space, do one or more the following two things: 1) Create a new logical volume in the vg volume group using lvcreate. (For example, a new /dev/vg/bar to be mounted on /var/bar.) 2) Extend another volume with lvextend and enlarge its filesystem by the exact same size using the appropriate filesystem resizing tool. Sincerely, Ken Fuchs <kfuchs@winternet.com> _______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
